Invention Grant
- Patent Title: Reduced memory vectored DSL
- Patent Title (中): 减少存储器矢量DSL
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Application No.: US13002213Application Date: 2009-06-30
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Publication No.: US08687497B2Publication Date: 2014-04-01
- Inventor: Nicholas P. Sands , Kevin D. Fisher
- Applicant: Nicholas P. Sands , Kevin D. Fisher
- Applicant Address: US CA Fremont
- Assignee: Ikanos Communications, Inc.
- Current Assignee: Ikanos Communications, Inc.
- Current Assignee Address: US CA Fremont
- Agency: Pillsbury Winthrop Shaw Pittman LLP
- International Application: PCT/US2009/049283 WO 20090630
- International Announcement: WO2010/002908 WO 20100107
- Main IPC: G01R31/08
- IPC: G01R31/08

Abstract:
A reduced-memory vectored DSL system includes methods and apparatus for reducing the bandwidth and memory storage demands on a vectored DSL system in which FEXT data is transmitted and stored. An upstream-end device such as a DSLAM communicates with a plurality of downstream-end devices such as CPE modems. When test signal data, such as training and/or tracking data, is sent to determine FEXT characteristics of the DSL system, error signals are available for all or substantially all of the upstream and/or downstream frequency band DSL tones used in the system. Dividing a frequency band into sub-bands, only a subset of tones in each sub-band is used for deriving FEXT data, such as a FEXT channel response, FEXT channel coefficients and/or FEXT cancellation coefficients. For tones in the sub-band subsets, full-precision FEXT data values can be derived. For other tones, approximations of the FEXT data can be derived.
Public/Granted literature
- US20110110409A1 REDUCED MEMORY VECTORED DSL Public/Granted day:2011-05-12
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